package Proxy

import (
	"github.com/gin-gonic/gin"
	"net/http"
)

func Cors(c *gin.Context) {
	method := c.Request.Method               //请求方法
	origin := c.Request.Header.Get("Origin") //请求头部
	if origin != "" {
		c.Header("Access-Control-Allow-Origin", "*")                                       // 这是允许访问所有域
		c.Header("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE,UPDATE") //服务器支持的所有跨域请求的方法,为了避免浏览次请求的多次'预检'请求
		//  header的类型
		c.Header("Access-Control-Allow-Headers", "sign, rand,timestamp, Content-Length, X-CSRF-Token, Token,session,X_Requested_With,Accept, Origin, Host, Connection, Accept-Encoding, Accept-Language,DNT, X-CustomHeader, Keep-Alive, User-Agent, X-Requested-With, If-Modified-Since, Cache-Control, Content-Type, Pragma")
		//              允许跨域设置                                                                                                      可以返回其他子段
		c.Header("Access-Control-Expose-Headers", "Content-Length, Access-Control-Allow-Origin, Access-Control-Allow-Headers,Cache-Control,Content-Language,Content-Type,Expires,Last-Modified,Pragma,FooBar") // 跨域关键设置 让浏览器可以解析
		c.Header("Access-Control-Max-Age", "172800")                                                                                                                                                           // 缓存请求信息 单位为秒
		c.Header("Access-Control-Allow-Credentials", "false")                                                                                                                                                  //  跨域请求是否需要带cookie信息 默认设置为true
		c.Set("content-type", "application/json")                                                                                                                                                              // 设置返回格式是json
	}

	//放行所有OPTIONS方法
	if method == "OPTIONS" {
		c.JSON(http.StatusOK, "Options Request!")
	}
	// 处理请求
	c.Next() //  处理请求
}
